javascript - 鼠标移出时自动隐藏第二级下拉菜单

Question

当我从第二级下拉触发器鼠标移出时，我遇到了一个下拉菜单的问题。这是我的网页pass:dropotron中的示例代码。

在我的网页上，我使用了一个名为“dropdown”的下拉 javascript 来使其工作。

这是 html 下拉菜单代码：

<ul>
    <li><span class="opener">1st Level<b></b></span><ul>
    <li><a href="#">Sample</a></li>
    <li><a href="#">Sample</a></li>
    <li>
        <span>2nd Level<b></b></span>
        <ul>
            <li><a href="#">This level does not</a></li>
            <li><a href="#">auto hide when</a></li>
            <li><a href="#">mouseout from 2nd level</a></li>
        </ul>
    </li>
</ul>

这是连接到下拉菜单的css：

#menu {
    padding: 0 45px 0 45px;
    position: relative;
    background: #209D9D url(images/img02.png) repeat-x top left;
    margin: 0;
    height: 60px;
    width: 890px;
    text-shadow: 0 2px 2px #007D7D;
    border-bottom-left-radius: 4px;
    border-bottom-right-radius: 4px;
}

#menu ul {
    list-style: none;
    padding-top: 12px;
    left: -42px;
    width: 110%;
    font-family: Calibri;
    font-size: 18px;
    position: relative;
    text-align: center;
}

#menu ul li {
    padding: 5px 15px 5px 15px;
    margin-right: 10px;
    display: inline-block;
}

#menu ul li a, #menu ul li span {
    text-decoration: none;
    color: #FFFFFF;
    letter-spacing: -1px;
    font-size: 1.25em;
}

#menu ul li span b {
    display: inline-block;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 7px solid #00eaff;
    margin-left: 8px;
    position: relative;
    top: -1px;
}

#menu ul li.active {
    background: #009bec;
    border-top: solid 1px #007cbc;
    border-radius: 7px;
    border-bottom-left-radius: 0px;
    border-bottom-right-radius: 0px;
    padding-top: 4px;
    padding-bottom: 4px;
}

#menu ul li.active span b {
    border-top-color: #37cdff;
}

.dropotron {
    background: rgba(0,155,236,0.9);
    border-bottom: solid 1px #1d7bc1;
    text-shadow: 0 1px 1px #007D7D;
    list-style: none;
    margin-top: -15px;
    padding: 15px 10px 15px 10px;
    min-width: 200px;
    border-radius: 6px;
    box-shadow: 0px 4px 4px 0px rgba(0,0,0,0.2);
    font-family: Gotham, "Helvetica Neue", Helvetica, sans-serif;
    font-size: 20px;
}

.dropotron a, .dropotron span {
    color: #FFFFFF;
    text-decoration: none;
    letter-spacing: -1px;
    display: block;
    width: 100%;
    position: relative;
}

.dropotron span b {
    display: inline-block;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 7px solid #00eaff;
    position: absolute;
    right: 10px;
    top: 7px;
}

.dropotron li:hover span b {
    border-left-color: #37cdff;
}

.dropotron li {
    padding: 3px 10px 3px 10px;
    margin: 7px 0 7px 0;
    border-radius: 7px;
}

.dropotron li:hover, .dropotron li.active {
    padding-top: 2px;
    padding-bottom: 2px;
    background: rgba(35,125,205,0.9);
    border-top: solid 1px #1e6db2;
    border-bottom: solid 1px #2c9cff;
}

.dropotron-level-1 {
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}